Body, generic

B00B1 Driver Seat Occupant Classification Sensor B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B00B1 marks the second of the five driver seat classification sensors. No carmaker documents it publicly, and the letter is not tied to a fixed spot. Seat weight systems often measure at the corners: a CTS patent puts one thick-film strain gauge sensor at each corner between seat pan and slide rail, so the occupant's whole weight passes through four bridges whose leads meet in one junction box before the airbag controller. In such a layout every corner could carry its own letter, which would explain a series from A onward, yet no public source confirms that order. A stored B00B1 therefore means one load input is open, out of range or implausible; seat bolts fitted with the wrong torque and harness strain after seat removal are typical suspects. The airbag lamp lights.

Likely causes

Seat refitted with wrong bolt torque or distorted mounting, loading the sensor unevenly
Strained or chafed lead to load input B under the seat
Internal fault of the strain gauge sensor

Symptoms

  • Airbag warning lamp on
  • Weight-based adjustment of the driver airbag unavailable
  • Safety note: airbag system; work on seat and sensor plugs only de-energised; calibrate the seat sensors after replacement or seat refitting, specialist workshop only

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

driver classification sensor bsrs seat wiringsrs control module

Related codes

B00B0B00B2B00B3B00B4B00A0

References: patents.google.com, patents.google.com, law.cornell.edu.